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N249 bypass

Discussion in 'A3/S3 Forum (8L Chassis)' started by cawsey20, May 27, 2010.

  1. cawsey20
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    cawsey20 Member

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    [May 27, 2010]
    Hi there , I'm giving the bypass a go on my s3. I've got the guide sorted and it states to use 4mm hose , now I've got some 3mm silicone hose which does stretch nicely over all the connections . Is there any harm in using a smaller diameter hose ? As all it is vacumme and does the same job . Cheers
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  3. sportstractor
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    sportstractor Chugger

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    [May 27, 2010]
    Will be fine, as said its for vacuum, so no worrys.
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  4. cawsey20
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    cawsey20 Member

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    [May 27, 2010]
    Cheers bud I thought that would be the case :) I shall crack out the toolbox .
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  5. rossbrownlee
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    rossbrownlee Ross_S4

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    [May 27, 2010]
    It is vacuum when you are off boost, idling for example. However, when you are booting it up the road at maximum boost just bear in mind that the hose, in fact any hose off the intake manifold, is under full boost pressure whatever that is on your car.

    and before anyone starts i am not saying that the silicone hose won't be up to it, i too have used plenty on mine. just suggesting to bear in mind that it is not vacuum only.
    #4
  6. Welly
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    Welly VX220 SC Driver :)

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    [May 27, 2010]
    3mm vac hose is fine mate.
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